2005 Polaris Sportsman 400/500 Service Manual, Page 65Get this manual
COOLING SYSTEM
WARNING: Never remove radiator cap when engine is warm or hotThe cooling system is under pressure FLOW Radiator
and serious burns may resultAllow the engine and cooling system to cool before servicing
System Pressure Test
1Remove radiator cap cover located in storage box2Remove recovery bottle hose from coolant filler3Connect Mity Vact (PN 2870975) to radiator and pressurize system to 10 PSIThe system must retain 10 lbs of pressure for five minutes or longerIf pressure loss is evident within five minutes, check radiator, all cooling system hoses and clamps, or water pump seal